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What is the opposite of inefficient?

Need antonyms for inefficient? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Opposite of not performing a task or function to the best advantage
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Adjective
Opposite of characterized by laziness, indolence, and a lack of ambition
Adjective
(of a faculty or part of the body) Opposite of reduced in quality or efficacy
“Owls are known for having powerful vision used for hunting prey.”
Adjective
Opposite of having or showing laziness, disregard or negligence
Adjective
Opposite of inclined to waste or squander money or resources
Adjective
Opposite of requiring significant amounts of time
Adjective
Opposite of that makes a loss
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